Filter frame



FIG. 1 is a perspective view showing the new design for a filter frame;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof, a bottom view being a mirror imagethereof; and,

FIG. 5 is a right side view thereof, a left side view being a mirrorimage thereof.

The portions of the filter frame in FIGS. 1-5 shown in broken lines areincluded to show features that form no part of the claimed design.

CLAIM The ornamental design for a filter frame, as shown and described.